Advanced music player for GNU/Linux, also running on FreeBSD, OpenBSD and Microsoft Windows. Plays audio CDs, internet radio streams, podcasts and soundfiles in just about any audio format and has the feature of inserting no gaps between adjacent tracks.

ChemVisio is software which might be useful for educational purposes (non-organic chemistry, crystallography etc.). It might be a good visualization support for all people who need better illustrations than that you could see in books.